if it is ok, or i have to enter some code to reach that to resumen where i was
No, you just enter to that directory.
This is mandatory? as far as I understand if I dont have problems with Sublime Text and the files it is not needed right?
I had been using Notepad++ which changes the permissions. I don't know if that's true with Sublime Text, but it's generally true for most Windows notepads.
3- before building, how I am suposed to change the genesis block exactly?
You need to change the values I've told you in
#2 from
chainparams.cpp.
1- once finished the genesis block configuration, how i am supossed to build this rightly? wich are the "codes" to enter on terminal for it?
The commands remain the same. Once you've generated a valid genesis block, from the program you've written, you just replace those few values from chainparams.cpp and you're done.
2- how to mining the first block? wich steps I should follow?
[ANN] Genesis Block Generator3- how to save the genesis block of the chain in the computer? I mean, for later use if the chain is being mined from diferent clients and I wan to update it?
You can't update the genesis block once there are new blocks mined upon it. Unless I didn't understand your question.
4- how I am supossed to update it in the future?
You download the new version of Bitcoin Core and redo those steps.
should I upload it to github once is start mining?
Why do you ask me such thing? It depends on what you want to accomplish.