Hi,
1. Please use the "How to do" template to trace the letters.
Q1: Here, "How to do" is a kind of an adjective? Yes, kind of.
Q2: Is "the" an article for the template? Yes.
Q3: Can you put just about any logical words (or a phrase) there in parentheses to define or specify the "template"? Yes. But use quotes, not parentheses. Don't make the words too long. Don't do this a lot, and don't do it in formal writing.
2. Please use (the?) "How to do" templates to trace the letters.
Q1: Is "Hhow to do" an adjective for templates? Yes.
Q2: Do you think, I need to include "the" in front of the phrase in parentheses? Yes. It sounds like you want to be specific.
Q3: Do I have to rewrite the phrase in parentheses? No. May be capitalize some or hyphenate some? No. Actually, I'd prefer not to capitalize the 'h'.
Best wishes, Clive