Mobile Usability help

Hello David,
I got this email from
Google Search Console Team.  Please help me to understand what I need to do about this issue.

Mobile Usability issues detected on

To the owner of

Search Console has identified that your site is affected by 2 Mobile Usability issues:

Top Issues

The following issues were found on your site:

Text too small to read

Viewport not set

We recommend that you fix these issues when possible to enable the best experience and coverage in Google Search.

thank you