What to do after I pick a disk in time machine to restore my iMac?
When I pick a disk in time machine to restore to what is the next step? It's just doing nothing!!
[Re-Titled by Moderator]
iMac, OS X 10.11
Your question is not clear.
If you want to backup using Time Machine, see > Back up your Mac with Time Machine - Apple Support
If you want to restore items from Time Machine, see > Restore items backed up with Time Machine on Mac - Apple Support
If you want to restore everything from Time Machine, see > Recover all your files from a Time Machine backup - Apple Support