How can I apply a tag to all tertiary & residential streets of a city?

How can I select all tertiary and residential streets of a city to put speed limit 50km/hr? I use iD editor which as I see does not have this feature.
Thank you

The same question was asked the other day on the help-website. The conclusion is you cannot. see answer.

You can edit multiple objects with Potlatch or JOSM. It would still be difficult to select all streets within a city. Do you have a boundary for the city ? If so, you could create an Overpass Query, and load the result in JOSM.

An example Overpass Query (works only in Overpass Turbo, try it here for Terhagen.

This has been generated by the overpass-turbo wizard.
The original search was:
“highway=residential in Terhagen”

The query was manually adapted to only include ways and to also include tertiary roads
// fetch area “Terhagen” to search in
// gather results
// print results
out body;
out skel qt;