Getting started :
- Download ObsTapQuery.jar from GitHub (Right click > Save as...)
- Launch Aladin (http://aladin.u-strasbg.fr/aladin.gml)
- Go to Tool > Plugins > Plugin controller...
- Click on 'Local add...'
- Select the ObsTAPQuery.jar file
- Click on 'ObsTAP Query' in the left area
- Click 'Start' button
To get more informations go to the ObsTAPQuery wiki