There is a password, it’s the password you use to sign in to AxCrypt with. But, that’s your personal secret password you should never share with anyone.
To share an encrypted file, select the ‘key sharing’ option, and enter the recipients AxCrypt ID (email address). This will cause a shared file key to be embedded into the file. You can then send the file to the recipient by whatever means.
When the recipient signs in to AxCrypt with his/her own password he/she will be able to open it.
See videos at https://www.axcrypt.net/ .