To create custom buttons in the ribbon menues
1. Open Sharepoint Designer, open the relevant list
2. Choose Custom Actions from the Custom Actions ribbon
3. Choose Display Form Ribbon to create a button i the Display Form.
3.1 Set a name
3.2 Choose which workflow to start or a url
3.3 Under Button Image give siteadress to a buttonicon.
3.4. In the field for Ribbon Location the string Manage can be exchanged for another ribbongroup. For example Action. This way we can control where our button is displayed. With the help of Sequence numbering the order in which they’re shown can be controlled aswell.