Help for Aimeos

AND ALSO when editing my cms page i cannot add image i add the image it opens a window "Select Image" but there is nothing on that window

NO PLEASE TELL ME HOW TO DO IT STEP BY STEP FOR EMAIL AFTER AN ORDER IS COMPLETED

It says confirmed your order and everything and we are sending you an email but i dont receive any email i am giving real email in testing how to setup the email system

How can i setup stripe payment system i've ran the command i found in the docs "composer req aimeos/ai-payments omnipay/stripe" now what should i do for the stripe payment system to appear in checkout and test if it's working or not