? Convert ENTER to a symbol such as a

First time poster. At work we have a software package that allows me to upload date using Excel. We use different function keys and someone sent me conversions for F1-F12, but I’m trying to convert the ENTER key. I would greatly appreciate if someone can assist me.

Here are the F1-F12 keys:
F1 ea
F2 eb
F3 ec
F4 ed
F5 ee
F6 ef
F7 eg
F8 eh
F9 ei
F10 ej
F11 ek
F12 el

The symbols did not convert properly. The e between the F-key and the letter should be a small square.