Here are the steps to assign resources in MS Project:
1. Open the task sheet view by clicking View > Gantt Chart.
2. In the Resource Names column (left of Predecessors), type in the name of the first resource you want to assign.
3. Click on the second task you want to assign resources to.
4. Click the Assign Resources icon (two heads) in the toolbar.
5. In the Assign Resources window, click on the resource you want to assign and select Assign.
6. Click on the third task.
7. Select Insert > Resource Assignment to open the Resource Assignment window.
8. Follow the same steps as #5