Actually, it is not possible for you to assign an issue to more than 1 user at one time. This is actually the default behavior of JIRA assignee.
Anyway as for your inquiry on adding the Multi User picker custom field, this can be done as follows:
- Go to Administration > Custom Field
- Create a custom field, select the multi user picker custom field type
- Configure the custom field as needed (custom field name, description, applicable context and applicable issue types)
-- Applicable context is mapping the field to specific project. Select global context to have it associated across all projects
-- Applicable issue types is mapping the field to specific issue type. Select global issue type to have it associated to all issue types
- Map the field to specific screens
You may find more details on this by checking the following documentation:
Hope this helps!
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