Word Change game

(The answer is: Impersonation, (for no. 22))

Difficulty: Medium

Write: Marksman
Then: Separate by 4 letters each.
Then: Remove first M and K
Then: Add after first word, M
Then: Add at after the words
Then: Swap first and second word
Then: Swap second and third word
Then: What is the word now?

man at arm?

Difficulty: Easy

Write: Medium
Then: Add Evade and close it with the word
Then: Add an L after the word
Then: Remove all letters except some to mean Middle Ages.
Then: What's the word now?

MediEvaL

Difficulty: Very Hard

Write: Skateboard
Then: Somewhere in the word, there is "teb", Invert it.
Then: Add Fig before the last letter
Then: Double the fourth letter from the end
Then: Add Rock after the fourth letter
Then: Change the first letter to a C and move it so that it's next to the other C
Then: Change the ninth (9th) letter that comes immediately before the alphabet.
Then: Remove the tenth, (10th) eleventh, (11th) twelveth (12th) and thirteenth (13th) letters.
Then: Double the third letter from the end
Then: Remove the word "or" which is spelled backwards somewhere in the group of letters.
Then: Change the last letter to a P
Then: Move the third to last letter to the third spot in the group of letters.
Then: Add "el" between the second pair of double letters.
Then: Remove every other letter beginning with the second letter.
(Example: Firebolt = Frbl)
Then: What's the word now?

kaibcckfffelfgf
O_o

Nope, the answer is, Kickflip!

I got stuck on the part with the alphabet thing.

Difficulty: Medium

Write: Hard
Then: Add Bump after the word, close it with the other word.
Then: Swap B and U
Then: Add R after the word, close it with the first word.
Then: Add also a K after the word, again, close it with the word.
Then: Remove all letters except some to mean a plate armour.
Then: What's the word now?

I really dont understand what close means...
Or anything else...