I put an sd card into my tablet but my apps does not give me an option to save to sd card. What am i doing wrong. Not good at this stuff so help.

This means the internal memory is full and the only way to add apps is to uninstall other apps that you have installed. Check to see if you have apps you no longer use and uninstall them.

Unfortunately, most apps will not load onto an SD card. You'll find that some apps will, if a card is installed, place data there. Mostly the SD Cards are installed for use in storing photos and videos taken by the user with the tablet camera. Newer tablets and smartphones are coming with more and more internal RAM to alleviate the "full" issue, but in most cases, you wither have to give up the new app, or remove one to get another.

Gordon, Move the stuff on tablet to the SD card to free up space.
Check the attached links,instruction and guides, Good luck
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How to Move Android Apps to an SD Card
Galaxy Tab How do move photos videos and other files on my Samsung Galaxy...
internal storage full how to move to SD card

There are several methods to help you set download application path to SD card by default.
Please follow the steps given below,
Method 1:
- Insert the SD card into the device, Touch 'File Browser' on 'Home screen'.
- Tap 'Apps', On Apps, select the 'App to be installed'.
- Tap OK to install the App to SD card.
Method 2:
- Tap 'Settings' on 'Home screen'.
- Tap 'Storage', Check to turn on SD card, and set 'SD card' as the default storage place.
Method 3:
- On your Android tablet or phone, tap the 'App drawer' icon from the home screen.
- From the displayed list, tap on the 'My files' icon.
- From the opened window, on the top right corner, tap the icon with four horizontal lines.
- From the displayed menu, tap the 'Settings' option.
- On the opened Settings window, under 'Select directories' on the left, tap the 'Set home directory' option.
- From the window that appears next, tap to select the desired folder or the entire external SD card where you want the files to be downloaded by default.
- Tap the Done button from the top right corner of the window when you are done.

GuruAid.com

If the tablet is running Android, in app manager click on the app you want to move and there should be a button 'move to sd card'. If it's 'greyed out', you can't move it.

The default on most tablets is to install apps to internal storage so the SD card does no good by itself. You can go into Settings>Applications and change the location for each app to the SD card. Likewise anything else you put on a tablet, particularly photos and videos get stored in internal storage. If you have taken a lot of photos and videos they can fill up your storage quickly. You can change this in the Camera app by tapping the settings icon and changing the storage option to SD card. You will still need to actually move existing photos and videos to the SD card manually or copy them to external storage and delete them. I would also change the image and video resolution in Camera settings to 640x480. This is plenty good enough for pictures you just want to look at on the device or share online.

You really should check the manual, to see how to move or to install the apps on the SD card. Not all Android tablets and phones work the same. You not giving any detail of yours does not make this easier.
Some systems can install the apps on the SD card and they can run from the card. Others only allow you to put apps on the SD card, but before you can use them, you have to install them in the internal memory.
Again, check the manual.

It's an under $50 tablet...what did you think you were buying?
Add an SD card for more memory. https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=owners%20manual

You could add a 32 GB SD card which costs more than the tablet...

Do this:
Move to SD Card Powered by Kayako Help Desk Software

In the settings of the camera app it should have something called 'default save location' or 'Memory in use' set it to "Ext. SD" card. Most tablets have an internal SD so it is important that you select EXT SD card (external SD card).
If you have already found that setting, and 'Ext SD card' is not listed as an option, you need to format that SD in the tablet itself so it builds the folders it needs. Put it into a PC first though to copy off anything you need because formatting it will delete all data.