I forgot my iCloud’s mail but I know the password

See the following Apple articles

If you've forgotten your Apple ID email address or phone number

If you've forgotten your Apple ID email address or phone number – Apple Support (UK)

If you can't connect or sign in to iCloud

If you can't connect or sign in to iCloud - Apple Support

B T W:

You are sign in here .  .  .  with your Apple ID & Password.

Your Apple ID is the personal account you use with all Apple products and services. It includes the email address and password you use to sign in, as well as the contact, payment, and security details that you use with Apple.

You can’t merge multiple Apple ID accounts.

What happens when you use the same Apple ID & Password that you use to sign in here?

See the following Apple articles

Sign in with your Apple ID -> Sign in with your Apple ID - Apple Support

Manage and use your Apple ID -> Manage and use your Apple ID – Apple Support (UK)

Note:

Never post your private information on a public forum, such as Apple ID, phone number and others.

That is asking for trouble. 

Have asked the host to remove it.

i have lost my another account but i remember the password so i don’t really know what to do and i need some advice about it.

Have you forgotten your Apple ID?, Check your Apple ID via your email box, see this Apple article: If you forgot your Apple ID

If you forgot your Apple ID email address or phone number - Apple Support                  

OR see -> Having trouble signing in?

https://iforgot.apple.com/password/verify/appleid

If you can't connect or sign in to iCloud

If you can't connect or sign in to iCloud - Apple Support