Patricia
Try copying and pasting his (Jonathan's)email address:
.................
Left click on his email address and when it goes blue right click the blue bit and then click on Copy which shoula appear in a box of options.
Go into your emails and start a new email, then right click in the "To" box.
You should see a box appear with "Paste" in it.
Click on Paste and his email address should appear there.
Then carry on with your email to him.
He's a really helpful guy, so if he can help you, he will.
Regards
Vic