PC Case has 3.5mm for mic and a separate 3.5mm for speakers

[TheDankMemer]

How do I get my earphones to work so that I can use my mic and get audio simultaneously

 

[smorizio]

if your mb has realteck chipset in the realtech control panel there a check box to make front and rear ports sepreat outputs. make sure it on and you be able to get audio out the front ports.

 

[hang-the-9]

How do I get my earphones to work so that I can use my mic and get audio simultaneously

Get a 4 pole to dual 3 pole audio adapter.