write a custom function for Wordpress site

I require a simple, yet logical code added to [login to view URL] in my client WP site, I know the code myself, but want an experienced coder to make sure its done properly without wasting time or experimenting. Type customcoder when you bid and I will then explain the code that needs to be written, for someone experienced, it won't take more than 1 hour, I can pay 15 USD at the max and a great review and more works. good luck