ctags is in the plugins folder.
You need to create a file ctags.cnf in the same folder (and make sure that this is the first ctags that is found in your PATH variable, in case you have other tools that use ctags and bundle it!).
I think the project plugin calls ctags all by itself, you don’t have to do anything.
But if you want to do it yourself, open a cmd.exe in your source folder, and just say ctags *.c or *.r or whatever.
This will create a ctags file that tells the editor in which line every function (or symbol) is defined. Then the editor should be smart enough to jump around.