I need my site upgraded and finished

General information for the website: My site is a Meme site www.flickpoop.com
Kind of development: Customization of existing website
Num. of web pages/modules: 7
Description of every page/module: the site for the post part is functional but needs some work. thanks
Home
About
Funny videos
Steamingflicks
upload
Contact
Description of requirements/features: www.flickpoop.com

Backend of this site needs to function better.
- Upload needs to be flawless.
- privacy policy needs updating
- The site os not optimized properly for mobile.
- user registration should be much better Im sure.
- Small things to make the site more attractive.
- comments sections need to be fixed
- security against spam needs to be boosted
- Disclaimer pop up stating this sit contains offensive material prior to entering.
and proper authorization for registered accounts.
Specific technologies required: backend functionality, security
Extra notes: