Since you have signed the honor code, you can absolutely make changes. That is the whole point of a common tree using the wiki system. More eyes looking at the same profiles, more people doing research, it all works together to improve the profiles.
That said, the profile owner has done a fair bit of work on this profile, it wasn't a simple "create-and-forget" profile. You do want to be sensitive to their style and their work. If you don't hear back in a reasonable amount of time, go ahead and make the changes, and be sure to include the source.