Codeigniter expert for little modification

We have a site coded in CI with a professionals database to whom the visitors can send emails. The process is going fine, but we want to do some little modifications: 1. Before the mail is sent to the professional, the user must receive an email from our side to confirm his address 2. Data from the visitor will be inserted in our database 3. To confirm his email address, the visitor will receive a link he must follow There are just 3 files affected. The only required is to build 2 or 3 simple functions and insert them where required. No designs are required: just coding Please, don't apply if you are not a CI expert.