That's good - thanks for the screnshots!
The left-most columns are disks and partitions in a tree structure, the right-most column is where the disk/partition is mounted.
You have the partition
dev/vda1, which is mounted at the filesystem root (
/), and two more volumes with a single partition on each, which aren't yet mounted.
All you need to do is:
sudo mount /dev/vdb1 [directory to mount the disk at]
sudo mount /dev/vdc1 [another directory to mount a disk at]
Which follows the final steps of Tom's tutorial here.