We do not object to your individual use of the logo in a personal and private manner.
Like, say for using the logo on a tee shirt you plan to wear yourself.*
If I'd asked our lawyers**, they'd probably want me to say that we do not grant others permission to use our logo in commerce. (That means no selling them. No using the shirt to convince others that you are me. Or Joel. Or Sparkles the Unicorn.)
*I think it's okay if you lend it to immediate family members, too.
**I asked my dad, who used to be lawyer, what our lawyers would say.