Theme : Harmonics

Hi Im new to WP and hope Im in the right place.
I have Harmonics as a theme for my web site a would like to know how to make some changes.

1. Would like to add my phone # to the top right hand corner of the header.
2. can I edit the footer.

My site is https://ecodesignerhomes.linux.hostaway.net.au/

Cheers

Rob