Switching back the email settings

[Kingfisher]

Ok I got two things that I need help on. How do I switch the settings from the free yahoo back to gmail and how do I get the mail screen back where you can swipe over and look at your mail back on it own screen just like the factory settings. thanks in adv

 

[lekky]

What phone do you have?

 

[Kingfisher]

eris