EAR on the calculator

This might not follow the sequence of your screen grab but it does the same thing.

1.
[2nd] + [ICONV]
You should see “NOM” which is the nominal rate, key in 10 and press [ENTER].

2. press arrow down twice till you see C/Y
type in 12 and press [ENTER] (that’s amount of times to compound a year)

3. press arrow UP to “EFF”.

That’s the effective rate, press CPT to get the EAR.

The blanks are for the arrow keys. In your example Nom = 10, C/Y = 12 and then you compute EFF. Its probably just as quick to work it out though.