Opening a channel, takes 3 confirmation blocks, that means in 30 min your channel is active.
But… those 30 min start only when your tx was included into a block. So it could stay in mempool longer until it gets through, depending on the fee you used. If you used a lower fee like sat/vB then it will take some time.
You can click on opening channel tx and open the mempool page to see when will be confirmed.
Patience, will get through.
Meanwhile, please read the getting started guide for umbrel and all the rest of the guides from the special section