Hi William, Welcome to WikiTree!
For a start, you should enter information about the yDNA test you took on your WikiTree profile. (You don't actually upload test results to WikiTree, just the fact of the test.) At the top of your profile page, use the 'Add' drop-down list to find 'DNA Test information' and enter your test information there. You will also need to change the privacy level of your profile to 'Private with Public Family Tree' so that others can see how your yDNA test applies to your paternal ancestors. After you make the change it will take up to 24 hours before the information will show up on your father's, grandfather's, etc. profiles.
On the William Thomas Poole-382 profile, in the biography section, you can write an explanation of how the yDNA tests 'prove' the line.