, Please 
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Border Type 1 : This is one of the most popular borders.
You should have a signature that something looks like this (could look competely different).
Step 1 : Make a new layer above all other layers and then select all, and do a 1 pixel black inside stroke. Stroke can be found by Edit > Stroke
Step 2 : Make a new layer above the 1 pixel black stroked layer and select all, do a 3 pixel black inside stroke, then a 2 pixel white inside stroke.
Step 3 : Turn the layer just made (in step 2) so that the settings are on overlay.
Your result should look like this
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Border Type 2 : Note this must have around 5 layers of brushing at least.
You should have a signature that looks something like this (could look competely different).
Step 1 : Make a new layer above all other layers then select all, and do a 1 black inside pixel stroke. Stroke can be found by Edit > Stroke
Step 2 :Then make a new layer below some of your brushes and select all, then go to Select > Modify > Border and do a 20 pixel border, then fill it with white.
Your result should be this
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