cant login to other COC base

Hello sir i can’t login my old account only this account open when I try to open my old account so please sir help me to open my old I’d thanks give me some idea sir

so you can start or carag another account or start a new base must be already loaded in an ID Appel (different account to the one you already have) so you have to have 2 accounts appel and both linked to the game but with the 2 different bases , this so that you can change accounts in the game center and be able to load different accounts in the COC ...