I can no longer add new projects for the Title reason. What do I have to do to change that?

I think that you'll find that "Synchronize" is associated with BAM, whereas "Add Project" is BOINC Manager.

If you start by using the BOINCstats manager (BAM), then you have to keep using it.
And perhaps ask about it on the BAM web site.

If you have configured an Account Manager (like BAM!), then the "Add Project" button becomes "Synchronize" on the Simple View.

If you'd like to still add a project, you can either:
- Click Tools -> Add Project (on Simple View or Advanced View)
- Go to the Account Manager's website, and add the project, and configure the host to attach to it, then use "Synchronize" to perform the add.
- Go to Advanced View, click Tools -> Stop Using ... then the Simple View's button will revert back to "Add Project".

Hope this helps!

Go into advanced view and under sync you should see add projects .

You should also be able to change account manager to Bionic, or Gridcoinpool without losing any projects you have or you stats