If you click on yours or any name in a post it takes to your homepage.
https://freerepublic.com/~littlejeremiah/
Again, replace the user name after the tilde (~). From there click the “In Forum” link and that takes you to the posts. Further, the link I gave you earlier is the exact link if you search FR by user name (in the drop down under search box).
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I’ve done it both ways for years but for some reason the usual way via “username” doesn’t work for me right now. I don’t have a clue why.