Restore iMac files from Time Machine

To restore a file or two, see > Restore items backed up with Time Machine on Mac - Apple Support

To restore everything, see > Recover all your files from a Time Machine backup - Apple Support

Please read the following user tip and restate your question/problem in detail: 

     Writing an Effective Apple Support Communities Question - Apple Community

Include:

What model and year is your Mac?

What file or files do you want to restore?

Or do you want to restore all files to a new Mac?

Whatever file you want to restore which version do you want to restore, the latest or one further back in time?