You will need to have the private key. I got my private key because i downloaded a file on github that helped me to find my private key on my blockchain wallet. I think it was bip39-master i got my private key from this file. So far I am not hacked on it i think you will be fine using this file to get your private key. After this you will have to fill your private key in and then you can import your adress.
I dont remember... how can i get my private key ? :/