Give access to Editor

I can’t seem to find out how to give access to the Testimonials to any other role besides Admin. I developed a site for a client – I’ve added him as an Editor – he doesn’t want/need all the Admin access for fear he might unknowingly break something. However, how do I give him access to the Testimonials? Nothing I do to the role capabilitites (using Capability Manager Enhanced plugin) gives him the ability to see this. Any ideas?

https://www.ads-software.com/extend/plugins/testimonials-solution/