From where can I make email account for my addon domain
You can create mailboxes for your addon domains just as easy as for your primary domain. To create such email account go to your cPanel > Email accounts.
In the Email section you can type in the name of the mailbox that you want to use and right next to it there is a drop-down menu from which you could select to which domain your new mailbox should belong.
You can find our tutorial on how to setup your email accounts here: