No you cannot stake XBY. It is not a POS coin. It utilizes a new algo consensus call Proof of Signature.

Go through the first page of the ANN, it has a ton of info on what XTRABYTES is . .

Here are some links for more information. If you have any more questions, please come back and ask.

https://community.xtrabytes.global/faq/xtrabytes-and-xby.3/category

https://blog.xtrabytes.global/technology/proof-of-signature-triumphs/

https://www.reddit.com/r/XtraBYtes/comments/7loffb/welcome_to_xtrabytes_read_this_first_for_more/

Newest Windows Wallet link is here:  https://github.com/borzalom/XtraBYtes/releases/download/pre-v1.3.0.0/xtrabytes-qt.exe