In this step we will map atoms to coarse-grained beads.
Switch to the Beads section (we skip the Weights section, as the weights will be mapped automatically).
Check the Group select checkbox. This will treat a carbon and its attached hydrogen atoms as a group.
In the molecular visualizer, click on the first carbon atom. This will select the carbon atom and its attached hydrogen atoms.
When an atom is selected, it has a yellow halo. To deselect an atom, click it again.
Press the Add button. This will create a bead with the name A1 of type A and a weight mapping A.
Now select the second carbon atom, and click Add. And, finally, the same for the third carbon atom.
The beads and weight mappings are now defined. Let us now proceed to the next step.