Adding Paypal link redirection

Hello all,

on my website I have just made a new page and form for a celebration. In the form I am asking persons to fill out personal info and also if they would like to donate to the celebration I am promoting I am asking that they select their desired option.

I am wondering how do I add an option for the donation to be included with the form (because if they donate for this particular celebration I want to know immediately that the funds donated are for this celebration)? or how do I make it so that the persons can be automatically redirected to the paypal donation page on my website upon completion of the form?

I know that I can add the link to the paypal page but I want it to be a seamless transition rather than making the user do more work (and them then not choosing to donate because it becomes too complicated).

Please help. Heres the link!

http://hylaumc.com/quinceanera-celebration/