changing the mail button assignment

[fruithead]

i just installed hannips wonderful sms application, however the mail button on my phone still takes me to the old messages screen, altho now it no longer has the option to go to messaging, and only wants me to go to email. how can i change the assignment of the button to open up my new sms app, or anything else i want for that matter.

also, i almost never use the internet shortcut on the today screen. how do i change that also?

thanks everyone!