Create a free OpenStreetMap (OSM) account at http://www.openstreetmap.org. All you need to sign up is an email address.
To make changes to the database, log in to your account and click the ‘Edit’ tab. Select whether you want to register the change immediately (‘edit live’) or only after the change has been saved (‘edit with save’).
To create a new way, click the map where the way is to begin. This creates a starting node. Each time you click the map thereafter, a new node is set and thus a new way that links the node to the preceding node. If you want to connect your way to an existing way, you click the node where you want the way to intersect with the existing one. This creates a shared node. When the way is finished, end by double- clicking the last node.
Click on an existing way to highlight it and make all nodes on the way visible. To edit a segment on the way, click a node, hold down the mouse and drag the node to where you want to move it. If you want to move the entire way segment, click a line and drag the way to where you want it.
If you want to delete a line segment, select the nodes on the way and press Delete.
The ways may have various tags used in route planning such as cycleways and footways. You add these tags using the round buttons seen at the bottom right once you have selected a way segment. You can either add tags yourself or copy tags from an existing way. To make it possible for programs like Journey Comparison to calculate journey segments, it is important that you spell the tags correctly. If you are not sure, check an existing way with the same tag. Please note there is also a need to add one-way segments. Once you have selected the way, you can tag it as ‘oneway’ with a button on the left-hand side.
When you are finished editing, click ‘Save.’ You will then also have the option to describe the edits you have made.