Cannot sign in - Facebook Apps

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you have to log out of your account and then you will be able to log on under a different account

First, look around. You might already be signed in.. Try to get into G-mail. In the upper-right of your screen, you should be able to find either a "sign in" OR a "sign out". If someone else is signed in, you'll need to sign them out, and THEN you will have the option of signing in. Don't give up.. You can find it...

Calculators have two similar signs: the regular minus sign for subtraction, and the negation (change sign) sign. When applied, the latter changes the sign of the quantity to which it is applied. The minus sign - for subtraction is on the central line, the negation sign is smaller and somewhat raised above the center line.
The change sign key may be marked (-) , (+/-), or +/-

Multiple sign-in is most convenient to use on devices that you don't share with other people (where you won't need to sign out to let others access their own accounts).

Sign in to additional accounts

1. Sign in to a supported Google product.
2. Click your name or email address at the top of the page.
3. Select Add account from the drop-down menu.
   
   
   
4. On the page that opens, enter the email address and password for another account you wish to access, and click Sign in.




Switch between accounts

Once you're signed in to more than one account in the same browser, you can easily switch accounts. Just click your name or email address at the top and click on the email address you'd like to sign in to.



Products that do not support multiple sign-in

Some Google products and mobile versions of Google products do not support the use of multiple accounts in the same web browser. Instead, they default to the first account that you signed in to from your current browser.
If you want to use an account with a product that doesn't support multiple accounts, you have two options:

• Sign out of all your Google Accounts and then sign in to the account you want to access.
• Sign in to another account using a second web browser Learn more.

Signing out

If you choose to sign out of any account while using multiple sign-in, you will be signed out of all your accounts. To resume using multiple sign-in, you will need sign in to one account and then use the Add Account option to sign in to your other account(s).

Yes, I have seen products such as the Wireless Solar Power Charged Light House Address Number Sign Steel Street. http://www.amazon.com/dp/B009QWFE54/ref=asc_df_B009QWFE542475613?tag=thefind0213148-20&creative=395261&creativeASIN=B009QWFE54&linkCode=asn

As you sign in, click the box - keep me signed in. This is on the yahoo sign in dialogue box.

Or

When you enter your sign in information at the yahoo sign in page, it will bring three options in a bar at the top requesting to keep me signed in, never to do so or to do it later. Please click on the first one

That is a relatively simple solution. You will have to remember to sign out of your yahoo account when you are done with it though.
Step 1 - Go to your web browser and visit www.yahoo.com
Step 2 - Look just below the search bar all the way to the right of the screen
Step 3 - If you are signed on then you should see something like this Hi, YOURUSERNAME | What are you do... | Sign Out | Page Options If you see that then sign out.
Step 4 - If you are not signed in you will see something like this Sign In | New here? Sign Up | What are you doing? | Page Options
Step 5 - Once you see that click Sign Up. Fill out the form and click create my account.
To Remember - When you want to use your account click sign in and sign in to use your yahoo account. When you are done remember to click sign out so your partner can sign in to their account without having to sign out of yours.

Have you tried to swich your enternet settings