Pass the raw user name for your account. Note: This may not be the name you see inside pages. To get this, find one of your posts. Then, find a place where your name is linked. (This will not be the My Home link.) Find the part of the URL that looks like your user name. Pass that for this parameter. I don't know if Uplink allows spaces in user names, but if it does, this version of your user name will not have them. It should also escape any characters not allowed in URLs.
{{{2}}}
This parameter mainly exists in case Uplink allows characters in its user names that aren't allowed in URLs. If your user name is different from {{{1}}}, pass that here.
"{{{1}}}"
{{{PMs Enabled}}}
If you accept PMs, you can state that by setting this to a non-blank value.