lakedistrict
Welcome to OpenStreetMap. 

If you go to http://www.openstreetmap.org and log into your account you'll be able to make these edits yourself. Just zoom into the area you want to edit, click "Edit", click on the object you want to change, click "Bank", use the search bar on the left to find whatever the building is currently being used for (eg "cafe" or "shop") and then add any details to it such as its name and address. You may want to move the node (marker) to a more accurate place if it not quite right. Then click save, typing a brief changeset comment so that other users know what edit's you've made (eg "updated bank in Grange" or "added some shops on Main Street") before clicking "Upload".

Happy mapping, 
lakedistrict :-)