Use the language customisation tool and customise the string "welcomeback" from the moodle.php (core) component. Alternatively, you can directly edit the file moodledata/lang/en_local/moodle.php and then purge lang caches, or have CFG->langstringcache set to 0. Log in to the site. TEST: Check that you see the message "Welcome back, ..." matching your customised string. As admin create a new user in the site. Using the same technique than in step #1, now edit the "welcometosite" string. Log in the site as the new user just created. TEST: Check that you see the message "Welcome, ..." matching your customised string. Examples of supported placeholder values: $string['welcomeback'] = 'Welcome back, {$a->firstname}! 👋'; $string['welcomeback'] = 'Welcome back, {$a->lastname}! 👋'; $string['welcomeback'] = 'Welcome back, {$a->alternatename}! 👋'; $string['welcomeback'] = 'Welcome back, {$a->middlename}! 👋'; $string['welcomeback'] = 'Welcome back, {$a->lastnamephonetic}! 👋'; $string['welcomeback'] = 'Welcome back, {$a->firstnamephonetic}! 👋'; $string['welcomeback'] = 'Welcome back, {$a->fullname}! 👋'; $string['welcomeback'] = 'Welcome back, {$a->alternativefullname}! 👋';