Signing in to Oshi
Logging in is the ordinary email-and-password flow: enter the address you registered with, your password, and you land in the cashier. If you set up two-factor authentication, you'll be prompted for a code after the password - more on that below. Don't have an account yet? Start at sign-up first, because there is no login without a registered profile.
If the password isn't working, use the reset link rather than retrying blindly - repeated failed attempts can trigger a temporary lock as a security measure. A reset email goes to the address on file, which is one more reason to register with an inbox you actually control.
Held or blocked accounts
This is the part worth reading carefully. AskGamblers logs complaints from players whose Oshi accounts were closed without a clear explanation, and a blocked account is the one login problem a reset won't fix. If you sign in and find your balance frozen or access denied, that is a policy action, not a technical glitch.
The usual triggers are incomplete verification, a terms breach tied to a bonus, or a flagged payment. Contact support and ask for the specific reason in writing - and be prepared for the roughly two-day reply time the reviews describe. The best insurance is prevention: complete KYC early and keep your play inside the bonus terms so there is nothing to flag in the first place.
Two-factor authentication
Given the crypto balances in play here, turning on 2FA is not optional in spirit. Once enabled, each login asks for a one-time code on top of your password, which stops anyone who has only stolen your credentials from getting in.
Set it up from your account security settings right after you first sign in, and store your recovery details somewhere safe - if you lose access to your second factor, restoring the account means going through support, and that is the slow lane. Protecting the login protects the wallet.