Lowercase to uppercase ALL

Hello i need a help how can remove (Αμάν) lowercase to (ΑΜΆΝ) with out (') and (Βασίλης) to
(ΒΑΣΊΛΗς) with out (ς) i need this to (Σ)

Have you tried an action of the type "Case conversion"?

Yes i find a way with strings but i dont know how to use string to put %artist%%string%(ς)to %artist%%string%(Σ)

Do you want to change the case only of

Then try an action of the type "Replace".

Can you tell me were can i find this or can you do me an example

See the documentation on Actions:

Because i am from Greece i dont understand how to but thanks for your replying to me

Is this correct:
ς = GREEK SMALL LETTER FINAL SIGMA
and
Σ = GREEK CAPITAL LETTER SIGMA

I'm not sure if this is still valid:

Just to try to see if it works:
Select some files in which you want to replace ς with Σ
Open Actions>Actions(quick)
fill the dialogue as shown


click OK and see if that works as desired

And maybe this thread could help too:

Thanks man it works but know i have another problem the for example in greek (Βγές από το μυαλό μου) in uppercase (ΒΓΈΣ ΑΠΌ ΤΟ ΜΥΑΛΌ ΜΟΥ) i can't remove the έ to Ε

What have you tried so far?

I just used Convert>Tag-Tag with
Format string: $upper($replace('Βγές από το μυαλό μου',έ,Ε,ς,Σ))
which had as result:
ΒΓΕΣ ΑΠΌ ΤΟ ΜΥΑΛΌ ΜΟΥ

Yes but how can i have this in multiples songs

Replace the fixed string with the name of the field in which you want to adapt the case
e.g. for ARTIST this would be:
$upper($replace(%artist%,έ,Ε,ς,Σ))

Please note that I used the function Convert>Tag-Tag and not the action of the type "Replace"