Mobile Errors – Google Indexing

Hi there,
Looking at Webmaster tools, its showing I have 3 errors for Mobile Usability.

I was wondering if anyone may know how I would resolve these?
All three errors are connected with on page listed in private content. This page is not an active page on my website.
1) Text too small to read
2) Clickable elements too close together
3) Viewport not set

I feel like this is probably a straightforward thing I should be able to figure out, but my brain is feeling overwhelmed and I always get nervous about errors interfering with how my website is ranking.

Thank you!!