If you want it added to the nav bar then you will have to manually.
If you don't understand anything or cant get it done please post back.
Pulse theme doesn't use the subs.php to make the nav bar...
I am not sure the link for simpleportal homepage but i think it is index.php?action=homepage - with that in mind here is what you will have to do (if the homepage link is wrong then just change)
To edit the menu just go into the index.template.php and find:
function vp_nav_bar()
In that function you will find an array called $vp_nav_bar_items. All of the nav bar items are in that array. If you need to edit the text you can just hardcode it in which just means write it out and remove the $txt variables or go into the index.english.php and find the text strings to edit.
for ex.
FIND:
array
(
'Title' => $txt['vp_forums'],
'Link' => $scripturl
),
ADD BEFORE:
array
(
'Title' => "Home",
'Link' => "$scripturl?action=homepage"
),