sharepoint enterprise – How to remove “Click for help about adding basic HTML formatting”

I have SharePoint 2013 Enterprise. In one of the Custom lists, specifically in 2 Number fields, this sentence appeared:
“Click for help about adding basic HTML formatting”
It’s nor easy for my users to use the form in such way. I’ve searched over and found out a few tricks also to open the form in another browser like explorer.
Please let me know if you had experience how to remove the sentence from fields.
Regards