The difference between POP3 and IMAP is that POP3 will only effect the specific device you're reading the emails from.
IMAP (What we would recommend) saves changes you make to your email account. For example, if you delete an email, on POP3 it only deletes it from your device. IMAP deletes it on the email account itself, so when you delete on your phone, it's reflected when you look at your computer. This is better for anyone who uses multiple devices, and also keeps your emails from adding up to a lot of data over time, as POP3 won't really delete them, which means that data is adding up on your websites data allocation, which is a decent amount of data, but is still a limited finite amount of data.
You often need to set up the outgoing and incoming settings separately. Most email apps will ask for your email and password then try to automatically detect settings. This often doesn't work well.
We recommend you click on "manual settings" or "advanced settings". This allows you to enter the information below.
"connection security" lists several options, but you only want "SSL/TLS"
For "authentication method" select "normal password" if it ask.