Cathie,
I suspect you’ll get the help you need to here, without having to pay for it 
.
Three questions:
1 - which version of RW are you using/experiencing the difficulties with? Does this page clarify how RW ‘knows’ where its addons are?
2 - when you say:
… which worked until I did something wrong yesterday…
are you referring to this?
3 - does this explanation of how Dropbox works help? If you point RW to the location in your Mac’s Dropbox folder, the fact that any files there (including your addons) are also being uploaded and synched with the Dropbox server is almost irrelevant. RW was designed to ‘find’ them in any folder; the Dropbox folder can be treated just like any other in the Finder as far as RW is concerned.