why my buy order is not accepted yet its been 2 days now

"BTC" buy orders for "SKULLCOIN" has been working.
You should get a notice of order matching, then you need to leave your "CounterWallet" open and logged -in to allow the BTCpay to finalize(you should get a notification of progress in wallet)(takes about 1 hour for btc transactions)
You can try buying "SKULLCOIN" with "XCP" (that is suppose to work better). I would need more info to track down the order and see if I can see what is wrong(pm me).
This is a new decentralized exchange. Everything is done without any third party intervention. Counterparty is still working out the bugs on "BTC" transactions(they have many updates this week/month).
Eventually we can setup a centralized exchange along with the DEX, but that is "NOT" going to be ready before launch. It would be great to see a CounterParty asset listed on Bittrex or Poloniex.
Here is what a CounterParty asset centralized exchange can look like.
https://www.melotic.com/markets/ltbc-btcIf you are purchasing "SKULLCOIN" now with "BTC" you are participating in testing the system.