And, as it turns out, it's impossible to give other users a link to these Briefs (Requests).
The reason is that, as I wrote, these Briefs exist only in your personal Notifications area.
As a result, you have to manually copy-paste all the information in private chats with potential candidates.
Then, if you find someone who is willing to do the job, you must ask them to create a custom offer that you can then accept.
(Since they cannot accept your request, because it's in your notifications inbox only.)
I'm flabbergasted that this process is so user-unfriendly, particularly given the revenue of this online marketplace, and its launch year.
Am I completely overlooking something obvious here that makes it all much easier, or what?