According to the form, this requires a matic address, not a bitcoin one.  You are in the wrong section.  All offers that are published in this section are paid in part or in full in bitcoins.  The altcoin board is convenient for posting your offer. 
According to your posting history, this is not the first time you have posted an offer to ask for testers. Can you be precise about the value of tokens you aim to offer as reward? tell about much budget you have for testing stage?