In Photoshop, you can create a custom brush by selecting the Brush tool and then clicking on the New button. You can then select a brush type or size, and then click on the OK button to create the brush. To use a custom brush, you first need to set up your brushes in Photoshop. To do this, select the Brushes tab and then click on the New Brush button. You can then select a brush type or size, and then click on the OK button to create the new brush. To use a custom brush, you first need to set up your brushes in Photoshop. To do this, select the Brushes tab and then click on the New Brush button. You can then select a brush type or size, and then click on the OK button to create the new brush.