It really is better to use your web browser and ask it to take you to https://bonesmart.org/forum/Hi there, the issue is that you can’t bookmark in an app only on The web itself - that I’ve now done.
I do find navigation difficult on this site and I am pretty technologically savvy.
Using the web browser, you can see some things that aren't visible when you use the app - such as signatures, that tell you when people had their surgeries and what they have had done. You can then bookmark your thread, too.
This area may help you to navigate BoneSmart -
https://bonesmart.org/forum/view/how-to-use-this-forum.74/
Lots of useful "How to . . . " articles there, but they are all written for using the web browser and Xenforo, not the app.
BoneSmart takes a little while to get used to, but once you get the hang of it, you'll wonder why you had a problem at first.
New Zealand

I so don't want to be an inactive 69 year old which would be quite natural to me as I love doing sedentary occupations.