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There are 2 possibilities to change "Welcome to Jomsocial" browser title page :
1. You only want to change "Jomsocial" word on there (example : "Welcome to My Web" or "Welcome to Always Action Network")
If like case number 1, you can go to jomsocial backend > configuration > Site and look at the right side.
change "Frontpage Title" value into what do you want :)
2. You want to change all words on there (Example : "This is Always Action Network" or "You are in My Web")
if like case number 2, you can go to your joomla folder > language > en-GB > en-GB.com_community.ini
search "COM_COMMUNITY_FRONTPAGE_TITLE" and change the value after "=" with your own words..
example :
this default value :
COM_COMMUNITY_FRONTPAGE_TITLE="Welcome to %1$s"
%1$s is refer to case number 1, this value got from jomsocial backend
you can change into
COM_COMMUNITY_FRONTPAGE_TITLE="Hi this is Action Network"
don't forget to backup your en-GB.com_community.ini file before change anything :)