OSM OpenStreetMap Expert needed

Very basic Yii page which uses OSM to display then set a location. When user enters the page, the map is supposed to be pre-zoomed into the general area which is determined by fields in the database, Street, City, State, Country and Zip/Postal. This part used to work but right now we are getting a blank page, we think because the previous dev used some sort of account which no longer exists. If there is an account needed, we need to set up our own. Second part is that when the map is pre-zoomed into the location based on address details, the user should be able to zoom in closer if needed, and once they have the address they want to set, click on 'Set Map' to save the lat/lon settings into the db. The db already exists and the columns already exist. Your job is only to make sure that the map pre-zooms into the area set by the address details, then let the user set the final coordinates. This job should take maybe one hour and maybe up to three or so if we need to fine tune any additional details to make sure everything works as it should. If you can help us do this, I will have additional work for you in the next week or two and perhaps ongoing jobs now and then as needed.