Go open it.
Look on the left side, you'l see Your ID > 111 111 111 [For example]
and you'l see Password > 1111 [For example]
You copy both of these, as lagger said, he will help you with finding your screenshots.
You go to lagger's profile when hes online, pm him your id and your password [Do not close it].
When hes connected to your computer, he will be controlling it, but you can close this control, and you can watch what hes doing, so dont worry its secured.
After hes done with checking the screenshots and uploading them, you can close teamviewer.
Every time you close the teamviewer the password changes.
You got it ?
For more information, you can search for it on youtube