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It means that your tier 3 unit has achieved max CP and can further upgrade it's stats with proof of merit item. take note that using this will lock your unit permanently to its current class.
Yellow arrow means they are at max CP as a tier 3 unit and can use the item Proof of Merit to get a buff and turn gold.
Now, if that character does not have the correct stats, he/she will not actually be able to upgrade to a higher class. For instance if you want to upgrade an archer to a warbow, but do not have enough agility, they will have the green arrow, but you won't be able to actually upgrade. It won't matter that your archer has reached max CP, if they do not have the stats, then no upgrade!
You can try to level them up or use the items to boost individual stats. Also you can do arenas if you have the orbs AND get some items that could help you, not to mention the xp to lvl them up.