If you have saved your mask image to a file, then open it and minimise it - be sure you know what it is called!!

Open tube, duplicate (shift d) close original and resize 75%, uncheck all layers

Duplicate layer

Click on glasses to hide top layer

Activate Bottom layer

Muira meister copies - increase the number so that the tube covers the whole layer

Gaussian blur 7

Dsb flux blast - do this four times using the different settings: up, down,  left and right percentage 20%

Duplicate layer

Load mask from image - use your drop down menu to select the mask.  Choose source luminence.

You will not be able to see your mask - but don't worry, it is there

Delete mask layer - answer yes to popup

Merge group

After this next step your mask will become visible

Inner bevel:

Drop shadow 4, 4, 95, 7

Activate tube layer

Give tube a drop shadow again, settings as before

Add any text you wish

Merge

Add border size 1 black