Adding meta data for Categories and Tags? Flagging as errors

I use ahrefs as an SEO tool, and it's picking up the following errors:

• Multiple H1 Tag - it's saying that for the Tag I have multiple H1 tags which are just the H1 tags of the blogs I have written so far 

My blog is also being picked up as having multiple H1 tags, which are just the H1 tags on blogs hosted on the blog itself? For example, I have 2 blogs, and the Blog itself is saying it has multiple H1 tags, which are just the H1 tags I have used on the two blogs uploaded (each blog has one H1 tag)

Also, is there any way of adding meta data to tags or categories? Or should I just not use them as they seem to be causing the issues.