With the package installation, you will get two permission sets
ValueText User (Template editor)
Assign those two permission sets to the users and ValueText User (Template editor) is assigned to only those who want to Create/Edit the templates.
Salesforce > Setup > Search “User‘ in quick find box > click on Users
1. Choose the user you want to assign a license to.
2. Click on Permission Sets on the top user record section, it shows the Edit Assignments button.
3. Click on the Eidt Assignments button and choose ValueText User and ValueText User (Template editor) and Save.