Step 1: get the account is done :)

Step 2: you need to click edit button at top left (do it at computer, not at mobile browser, default editor is not working well at mobiles). The editor will recommend a tutorial, I strongly recommend using it.

Step 3: lets start from adding shops, that is much simpler - navigate to https://www.openstreetmap.org/edit?editor=id#map=20/52.33243/16.81296 in edit mode (this link will open map in the edit mode)

Step 4: press "point" button in top menu, press where shop is located, in search bar type shop type (for popular brands also typing brand name may work), select match.

You can add shop name etc. 

Step 5) press "save" in top right

Step 6) describe edit in top-left text area (mention how you know that shop is there, preferably in English or Polish)

Step 7) press Upload button (big blue one)

After you did it your edit is in live the OSM database - there is review queue or something similar.

Data consumers will update in time that depends on their shedules.

To fix road name: select road and edit/blank name field and upload changes (this may be simpler than adding shops actually)


Ask here or on https://forum.openstreetmap.org/viewforum.php?id=23 (login with OSM account) if you have any trouble.