If it has two optional blue symbols do you do either one of them or can you do both if you want?
Treat each blue box as a distinct option.
Also when it says swap symbol is the only one that is optional is this in any coloured box? as it says you have to do the yellow boxes so the wording in that is confusing.
The swap is the only symbol which is always optional. If there's a swap in a red or yellow box you can choose to ignore it if you wish.