Can someone help me fix? It is the first time that I install them and it does not allow me to create an account
That suspension warning can be ignored, just hit OK and sign in again. Once your sign in is successful (your Klab ID is appearing on the top right on the screen), then install/patch <mod> apk over, turn on permissions and you're good to go.
If you are starting a new account, either re-install the account linking app and try again (since early account, no risk losing anything) OR you use the playstore version to do it. Once you have linked to Klab ID, uninstall playstore version and install the <account linking> apk to sign in, then patch <mod> apk over. You can use the renaming of "com.klab.bleach" folder to save you 1.8gb data download each time. Google "Bleach Brave Souls rerolling" on how to do it, you also need a file manager to access your android's directory.
**I recommend using a dummy account to carry your main account in Co-op and Epic Raid only, avoid modding on main account unless you accept the risks. Do not mod GQ for the time being until it is tested to be safe, detectors are VERY active in GQ.**