Reading previous posts in this thread, I feel that you worry about being accused of not being the real owner of your account if you change that address.
The address shown in your profile is 1H2MwhKRRgg8SAqQ4rvFnwr9s3MBRsAqqc.
Even if you are accused of not being the real owner of your account, you cannot prove your ownership using this address. Because you have never used it before. I checked your post history and couldn't find that address. The balance of that address is also zero. So, I don't think there is any benefit in having control of that address.
You have signed message from a different address.
-----BEGIN BITCOIN SIGNED MESSAGE-----
i am jsmbugu from bitcointalk.org and today July 06, 2019
-----BEGIN SIGNATURE-----
bc1qc3h9w6qa3q4pru7umv0m4kz4297ecuakfrlzvq
IE3scZk6tWbWJF7MCzRXWjCqzt6gFYwkjrCwBwdRjeZqRmiXpfA5CX4RHmykwrkdgXI1oJY5PsDoPAG XVEMjHr4=
-----END BITCOIN SIGNED MESSAGE-----
Perhaps you have changed your profile address recently and you are trying to gain access to that segwit address, so you can prove your ownership in future in case of being accused.
If this is the case, I am sure that address doesn't belong to blockchain wallet. Because blockchain wallet doesn't support segwit.