I am trying to apply a fix by 'creating a registry'. but I do not know how

I found this post Solved: Re: How to disable automatic smoothing of the penc... - Adobe Community - 9886747

to disable smoothing for the adobe acrobat pencil. I see the fix but I do not know how to create a registry. Can someone please detail the steps.

the fix:

you need to create a registry to enable this fix. Please follow the steps-

- Close Acrobat if already running

- Create registry "bDisablePenToolSmoothening" and set it to 1, complete path of the registry dword for Acrobat DC is:

   [HKEY_CURRENT_USER\Software\Adobe\Adobe Acrobat\DC\AVGeneral]
       "bDisablePenToolSmoothening"=dword:00000001

- Now try using pencil tool and see if smoothening is disabled.

Many thanks