apparently still now or did I miss something here in the list because I just put the pair, next is the destination address and the refund address incase there is a problem and the only option i had here is the Chain not the Fast feature so the exchange button are currently disabled. So the wallet I provide in the destination was green as an identified as recognize address. Or did I miss out something here?
From everything you said and the screenshot you shared, it is clear that you filled in everything correctly. The "Fast" feature is not available there but that isn't an issue. You still followed all the right steps for exchanging through the "Chain" option, yet it is showing this. DEX.fo_off has already said that this may happen because of maintenance. You didn't leave anything out, it seems to me that it was probably a temporary maintenance/technical issue.
Try again and see if it works properly. There may be some network-related problem, so try exchanging according to the process again. If there is still any problem then the matter can be discussed with the team.