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hello guys 
i want to edit the second sim card contacts and i dont know how can i edit it ... any app to enter in the sim contact's to edit them ???
You need a 3rd party app to edit contacts saved on SIM, many available on play store.
Hi @Michy_Spiky,
There's no way to directly read from the SIM contacts while editing them natively, so what you can do is that you first import the contacts > Edit them > Export them back to the SIM. To do so, go to Contacts > Menu (3 dots in the top right) > Import > SIM(1/2 if dual) > Edit the contacts > Menu > Export > SIM(1/2).
Alternatively, you can do as @alexdon suggested and try a third party app for that purpose. 
and Choose Add Contact or Replace all contacts ?
If you have updated some contacts, you can replace them without a problem. If you are not sure, just add.
If you add a new one, it will create place for a new contact on your SIM. If you replace, same contacts will replace the old ones (adding new ones there too).