The first thing you will need to do is dust the dubia roaches with calcium power. This helps correct their natural imbalance of calcium to phosphorus — the ideal Ca:P ratio is 2:1, and Ca:P ratio in dubia roaches is 1:3 to 1:4. It's easy to dust dubia roaches with calcium. Simply place the roaches in a paper or plastic bag with some calcium powder inside, and gently shake until they are lightly coated.
There are a few different ways to feed your pet dubia roaches. One way is to use a separate tank or feeding tub. Transfer your pet to this enclosure, release the dubia, and watch your pet hunt!
Alternatively, you can place the dubia in a feeding bowl or hand-feed with soft-tipped feeding tweezers. Note that dubia are able to climb out of most bowls, so it's a good idea to use an escape-proof feeder dish.