
You can make lines or texts glow by using Glow (Outer).

Open ① Tool Selection window, use the ② Bucket tool, and ③tap the canvas to color it black.

Open the ① Layer window and create a ② new layer on top.

Draw some lines or texts with a white pen. (You can also use the Text tool)

Tap ①Layer window and add ②New Layer below the text.

Return to the canvas, open the ① Tool Selection window and select the ② Filter.

Select the ① Glow (Outer).

Drag the ①Slider left or right to adjust the radius.

Tap ①Color Picker . Drag the ②Slider left or right to adjust the color.

When finished, return to the canvas with ①✓ button.

Tap ①Layer window . Turn on ②Alpha Lock and color it with the airbrush to create a gradation like the finished image.

And you're finish. You can create neon effects like this with Glow (Outer).