Combine these amino acids into a tripeptide. Add or remove atoms
and bonds as needed.
You can see I have changed a few things, I
just can not seem to get it.
Answer
General guidance
by using the concept of valence of elements, removal or addition bonds can be done to get tripeptide structure.
Amino acids are organic compounds which contain functional groups such as 
(amine), 
(carboxyl) with 
(alkyl) groups present in theside chain.
General form of a tripeptide is;
AA-AA-AA
Note: when two amino acids combine peptide bond is formed.
Step-by-step
Step 1 of 3
Write valency of each atom present in the tripeptide
Valency of each atom is tabulated according to its electronic configuration.
Carbon: 
So, valency of carbon is 
Likewise;
Nitrogen: 
Oxygen: 
Hydrogen: 
Step 2 of 3
Atoms which don’t satisfy valency are circled in red.
From the valency of elements and structure in the question, we can observe that nitrogen should have avalency of 3(maximum of three bonds). Other elements in structures like C, O, and H has stable valency respectively. In the given structure, Nitrogen (circled in red) has 4 bonds surrounding it, making it positively charged.
Step 3 of 3
When one bond is removed from nitrogen (was circled in red fig 1), it gets satisfied with 3 neighbouring bonds.
Structure of tripeptide will be
Removal of bonds in Nitrogen (circled in red) will make nitrogen to have avalency of 3, nitrogen surrounding with three bonds.Removal of a single bond in nitrogen makes it have complete tripeptide structure.
Answer
Structure of tripeptide will be
Answer only
Structure of tripeptide will be