Thx all for your help,

I rode all the documents and guides you just told me, I have my back up (private keys) export from Bitcoin.com wallet on my desktop.
I followed the instruction to import private keys with Electrum, here I am:
on Electrum screen, it ask me to enter a list of private keys, so I copy/past my backup from bitcoin.com wallet (text format), and electrum doesn't recognize the keys I guess? cause I can't click on the "next" button.

sorry, a bit confusing for me