Not sure if you found out how to do this, but I think all you need to do is go to the main upwork page (the page where the jobs are posted), and simply click the 'saved jobs' link just under the Upwork logo.
Hope this helps.
Doesn't look like this button exists any more...
If so, can you please include a screenshot?
If not, can you please include the new instructions?
I saved a freelancer, but did not attach them to a job posting - I just wanted to tuck them away for future jobs.
In order to access your Saved Freelancers, please click on the posting on your Jobs page, then go to Invite Freelancers> Saved Freelancers.
I hope it helps.