PHP & MySQL expert

I already have a php User & Admin Membership script "based on PHP & MySQL with Codeiginter3 as its framework".

I need someone to make some changes in the script.

In User dashboard i need to:

- change a little bit the existing form or create a new one so that the user can send files or text in the format i want.
- in his dashboard user can keep track of links / files he sent.
- Add a Drip feed function to the form, so when a user send links, he can choose to split the links on a selected number of days.
- Script already have integrated membership payments with Paypal but i need to:

When a user pay for a monthly subscription he will receive a number of credits accordingly to the plan he bought. Those credits can be used to upload and send links to admin.

I can provide with real website examples on how i need the job to be done.

Admin dashboard:
- I will receive those files and can see them or download them in text document.
- From admin i can manually edit ( add or remove ) links from users balance.
- I can delete ( old files ( links) sent) so the database don't become to big and slow.

I already uploaded an image with functionalities i need.