Okay, it looks like you have two separate issues here.
From your first screenshot, the NSRL is a known type of hash set (it states “NSRL or other” right next to the box).
Secondly, the hash set that you currently have highlighted is read only. Which means that you cannot add hashes to that hash set.
You need to create a new hash set that you can actually edit, following the instructions listed in the video and in the lab steps. Please note that importing the NSRL, and creating an entirely new hash set, are two completely separate things.
- Import the NSRL File (NSRLComplete.txt-md5.idx) that you previously downloaded in Section 1.
- You may need to unzip the file you downloaded.
- You can use the default values (i.e. Type: Known).
- Create a New Hash Set:
- Destination: Local
- Name: Ransom Case
- Hash Set Path: [Any folder on your computer]
- Type: Notable
- Use “Add Hashes to Hash Set” button to copy and paste the following MD5 value into the “Ransom Case” hash set. This is the hash of the ransom note.