ok, now that you have launched the remote assistant application you will see a new screen

look for that part where it says:

Invite someone to help you (see my picture)

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Remote Assistance

Intive someone you trust to help you. Using an Internet connection, your screen, and with your permission, work on your computer.

* Invite someone to help you

* View invitation status

Tell me more about Remtoe Assistance

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so click on Invite someone to help you

and continue with the next step