We would like to add a custom field to MWO, we followed the following answer (https://community.ifs.com/service-touch-apps-mwo-mro-43/mwo-customization-new-field-14556) we made all the steps but we are blocked on step 11. Where could i find the UI DESIGNER ?
How could we use UI DESIGNER please. 

For information we use IFS APP10 EE UPD 18