Help! New Owner of BH Discovery 3300 with Pinpoint from Missouri

[Sweet Lady]

Hi, I just bought a Bounty Hunter Discovery 3300 with pinpoint online. Absolutely new at metal detecting. My boyfriend and I are unable to use it because it won't stay on.
We are in our 50's and disabled vets, so thought this would be a great hobby. Not so much now. Help!!! Boyfriend getting really frustrated.

 

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