turn username into a profile link

[RateU]

Yep. The script used when sending PM.
The js could be found inside private_send_autocomplete template.
You need to modify it (especially for the ID of the input), and add an ID to your custom field.

Here is a simple example for that (assuming the field is a textbox):
Edit the field:
Allow multiple values for this field: Yes
Use Custom Input HTML: Yes
Input Field HTML:

HTML Code

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<input type="text" id="xtun" class="textbox"{NAME_PROP}{MAXLEN_PROP}{WIDTH_PROP_SIZE}{TABINDEX_PROP}{REQUIRED_PROP} value="{VALUE}" style="min-width: 300px;" /> <link rel="stylesheet" href="{$mybb->asset_url}/jscripts/select2/select2.css?ver=1806"> <script type="text/javascript" src="{$mybb->asset_url}/jscripts/select2/select2.min.js?ver=1806"></script> <script type="text/javascript"> <!-- if(use_xmlhttprequest == "1") { MyBB.select2(); $("#xtun").select2({ placeholder: "Username(s), separated by comma. Maximum 3 users.", minimumInputLength: 3, maximumSelectionSize: 3, multiple: true, ajax: { // instead of writing the function to execute the request we use Select2's convenient helper url: "xmlhttp.php?action=get_users", dataType: 'json', data: function (term, page) { return { query: term, // search term }; }, results: function (data, page) { // parse the results into the format expected by Select2. // since we are using custom formatting functions we do not need to alter remote JSON data return {results: data}; } }, initSelection: function(element, callback) { var query = $(element).val(); if (query !== "") { var newqueries = []; exp_queries = query.split(","); $.each(exp_queries, function(index, value ){ if(value.replace(/\s/g, '') != "") { var newquery = { id: value.replace(/,\s?/g, ", "), text: value.replace(/,\s?/g, ", ") }; newqueries.push(newquery); } }); callback(newqueries); } } }); } // --> </script>

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* the above code based on 1.8.6. I don't have MyBB version above 1.8.6. So maybe you need to modify it a bit.

Multiple Value Delimiter: ,

Change the maximumSelectionSize if you are allowing more than 3 usernames.