To add a new option on a dropdown menu within SIMS e.g. behavior activity type or medical condition go to:

 

Tools > Lookups > Maintain

 

Press the Search button, this will list all the lookups available to change

 

Double click on the Lookup, and the press the New button, when making a new value, double check the 'active' box is ticked

 

A log out of SIMS is required for the changes to be updated