No store sells on the POS
What you see
In the admin, on Settings › Stores, marked Needs attention with this title, and on Home among what needs you. Code: ZP-NO-POS-STORE.
What happened
None of your locations is set to sell on the POS, so zrsPOS has nowhere to issue documents.
What to do
In Settings › Stores, answer "Does it sell on POS?" with Yes for at least one location and set it up (série, document types and the other fields). Save.
Can zrsPOS do it for you?
No. Which store sells on the POS is your decision.
Still stuck?
Write to support@zrspos.com and quote the code ZP-NO-POS-STORE, with the shop name. We reply in Portuguese or English. For more, see Stores.