i cant add bookmark on MacBook pro

What error messages are you getting? Full details on your Mac would be helpful.

Syncing is done via the Apple ID; all devices must be signed in using the same ID. Give it time, nothing is instantaneous. If you are already signed in, sign out and right back in on all devices. I've had to wait 24 hours a couple of times for full sync to take place.

Which browser cannot add bookmarks?

I have three browsers I use regularly for various reasons.