If you already know how the relation would be tagged, the OSM Relation Analyzer can be more convenient:
#Go to the [http://ra.osmsurround.org/ OSM Relation Analyzer].
#Type in the item name and click Search.
#Set Relation Type to [[OpenStreetMap:Relation:route|<kbd>route</kbd>]].
#Set [[OpenStreetMap:Key:network#Public transit routes|Network]] to a route network identifier, such as <kbd>COTA</kbd>, or set [[OpenStreetMap:Key:operator|Operator]] to an agency name, such as <kbd>Central Ohio Transit Authority</kbd>.
#Set [[OpenStreetMap:Key:ref|Ref Tag]] to the route number, for example <kbd>10</kbd>.
#Optionally set [[OpenStreetMap:Key:route|Route]] to <kbd>bus</kbd> if the same agency assigns the same route number to a bus line and another kind of route.
#Click Search.
#Click the relevant relation ID (generally several digits long), then click Browse to see it on the OpenStreetMap website.
