You'll probably need to edit the .htaccess file sooner or later. For this, please follow steps below.
1. Login to your cPanel account and press on "File Manager"
2. In pop-up menu choose "Web root" and "Show Hidden Files". (All hidden files in linux have a dot before name).
3. Click on the "File" button with the plus icon to add a new file, then enter .htaccess as a file name. 
If .htaccess already exists in public_html directory, either:
(A) press on it, then choose "Edit".
(B) Right click on it and choose "Edit".
4. Simply agree by pressing edit. 
5. Insert what you need in the file, note that # means that it is a comment, it's a great way to put notes in files like these. Everything after # is typically ignored by the software reading the file.
6. Press "Save changes" and the changes will be applied.