i had a quick look at this "panel", and in my opinion the best solution may be
1.
to change this line
{.if|{.%user%=admin.}|
in
{.if|{.member of|administrators.}|
2.
go to hfs > accounts, and create a group "administrators"
3.
in the same place, select the accounts you want to access the panel, and set them as "member of" the "administrators" group.