The clear is using when floating element.
Eg: if you are adding an image to the left side and one is right side then you can use [clear] just below it so it will be clear the float element for next contents.
For this we need to make small changes in css file. Please send your site url and the login details to support@flythemes.net so we can resolve it asap.
Please send us the site url so we can check the backend for comment issue.
Its not possible to add testimonial from the customer. For this you need to use customer review plugin.
