When you are asked to select a variable, you have to type in the exact name, symbols like !, ^, letters and all. Rank: This is the rank of the player. For example, if you enter VIP, [VIP] will appear before the player's name. Username: The username of the player. Text: What you want the player to say. Color:, !Color:, ^Color: The colors of the rank/username/text. Color list: black, dark_blue, dark_green, dark_aqua, dark_red, dark_purple, gold, gray, dark_gray, blue, green, aqua, red, light_purple, yellow, white Effect:, !Effect:, ^Effect: bold, italic or underlined There are ! and ^ symbols before some of the variables because I can't use two variables of the same name. Once you are ready, click the green button and answer the Which variable would you like to edit? question with something random like 1252345215134fjskrgtw4586g. A list containing your needed command will pop up. You are able to copy + paste from this list. If the command isn't working, try pasting it into a command block instead. Sometimes commands don't fit into chat.
INSTRUCTIONS UPDATE If you set Rank: to NoRank, you won't have a rank If you set Username: to NoUser you won't have a name A Work in Progress, sometimes... doesn't always work. :}