How could I setup an external flash to my Canon rebel xs

SOURCE: Quantaray QDC 900WA no longer works on Camera Hot shoe

tengo un flash QDC 900WA PERO COMO HAGO PARA QUE TRABAJE ESTAVA TIENE FUNCION ESLAVA EL FLASH O TENGO QUE COMPRAR LA UNIDAD ESLAVA APARTE

SOURCE: attaching my Canon Rebel XS to my Baush & Lomb telescope

You need an adapter ring that adapts the camera's lens mount to the telescope eyepiece. Most telescopes use the same size eyepiece, but you should ask the vendor before purchasing to make sure the ring will fit your particular telescope.

SOURCE: Internal flash not working because of non compatible flash installed

Solution:
Look at the external flash socket.
With the camera in "normal position", i.e., poiting away from you, you shoul see a very small (I realy mean very small) piece of plastic under the rigth inside of the flash shoe... it is the "external flash sensor". It probably is stuck. Work with the point of a knife to try and release it.
In more detail, if you look carefully at the external flash shoe, the are two metal pieces that will help create some pressure. So the flash holder (shoe) is made of two parts: a very rigid one and the metal blades that create the pressure. Look under the blade located nearest to the shuter button.
If you can locate the plastic piece (black in my camera, but can be white) try to have unstuck.
Worked with my camera.
regards
Mig

SOURCE: Canon Rebel XS displays busy signal after I take a

Is your card nearly full? Is your battery fully charged?

SOURCE: The metering screen inside the viewfinder keeps

I can help you fix the BUSY Error or Error 99 of your Canon EOS Rebel XS / Canon EOS 1000D.

Installation of this Canon EOS Rebel XS / Canon EOS 1000D firmware version 1.06 update will solve these problems:

1. Some cameras may exhibit a phenomenon in which the LCD monitor does not display, the shutter does not release, and the BUSY indication remains lit in the viewfinder.
2. The message, "Err 99 Shooting is not possible. Turn the power switch to<OFF> and <ON> again or re-install the battery", appears on the camera's LCD monitor, and after the above operation is carried out,the LCD monitor displays in a language that is different from the actual language setting.

1. Follow this link to download a pdf version of the firmware installation instruction guide.
2. Follow this link to download the Windows Version of the Canon EOS Rebel XS / Canon EOS 1000D firmware version 1.06 update.
3. Follow this link to download the MAC version of the Canon EOS Rebel XS / Canon EOS 1000D firmware version 1.06 update.
4. Follow this link to download the Canon EOS Rebel XS / Canon EOS 1000D Instruction Manual.