On those occasions when you want to show your cards at FullTilt, you must make sure that Auto-Muck is not checked, (main lobby - options). Then you have to act fast to show the cards, FT only gives you about 2 seconds to choose at the end of a hand. There is no fold and show like there is at UB.
Make the window you want active. Alt-PrtScn will take a picture of that window. PrtScn alone will take a snapshot of your whole screen, and all the windows in it.
Open Paint. Paste, and you will see what you took a snapshot of. Move to the bottom right of the whole paint window and drag that corner up to the lower right corner of the snapshot you took. This will eliminate large areas of white space.
Save that file with an appropriate name as a .JPG, or .JPEG file. The default for Paint is BMP, and they end up being huge pics requiring scrolling, we don't want or need that.
When you want to post that pic, open the post reply window, scroll down to 'Manage Attachments', click and a small window will appear.
Click browse. It will browse, with your help, through your PC.
When you find the file you saved as a JPG, open it, then upload it.
When the upload is complete, the filename will be displayed below the Manage Attachments button. Drag that filename into the post and drop it.
Preview the post and if you like it, post it.