Login to your FTP account.
Open and Edit .env
file.
Copy and paste your server smtp details in the file.
It will look something like this.
MAIL_DRIVER=smtp
MAIL_HOST=mailtrap.io
MAIL_PORT=2525
MAIL_USERNAME=163098f2d69fc3dcd
MAIL_PASSWORD=d299383477f64a
MAIL_ENCRYPTION=tls
SENDERS_EMAIL=yourEmailHere@example.com
SENDERS_NAME=Your Site Name
Save and Upload the file
You are done.
If you like test your setting check Testing STMP