85 HP Javelin outboard throttle issue

[superharmonix]

I have an 85 HP Javelin outboard I just bought and it runs awesome. The only issue is when I throttle up, then back off, the arm that the throttle cable attaches to in the engine doesn't back off all the way, so the RPMs are way too high. I can manually push the arm the rest of the way back off and it is at the correct idle speed. I believe I need to make an adjustment with the cable, but I am not sure how to do it!

I am sure it's probably obvious I am new to boating.. Any help is greatly appreciated!

Thank you!