Payment through IRS Direct Pay after efiling

[_confused_]

I have some balance due to pay with my tax return.  Can I pay via IRS Direct Pay on the IRS website, while e-filing tax return ?

I read similar posts on this board and, based on what I read,  I should choose "Pay by check", and proceed to efile.  After finishing e-file, I go to the IRS website and pay.

Is this procedure correct ?

If I do that, the e-filed tax return and payment are accepted separately by IRS.  Do I need to do anything on the tax return to indicate that I paid through the other payment method, or does IRS figure it out as long as I choose the correct form and year during Direct Pay ?

[Mike9241]

mark mailing check. then you can use IRS direct pay. you will specify the year and paying balance due a;pmg with other info. that will enable the IRS to match up the payment with the return. 

nothing is entered on the tax return for this