no diskstation found Synology ds718+

Hi everyone,

I bought nas synology ds718+, I connected it to the router, from the browser I called find.synology.com to search the nas network, but it tells me no diskstation found within the lan network.

The router is a fritz! Box 7530, I use opensuse 15.1

I am a beginner and have never used a nas.

Do i need to activate a firewall? Which?
Do i need to create a VPN?
What i have to do?

Sorry if these are trivial questions

Could anyone help me?

Thanks in advance for the help

I can’t do this https://www.youtube.com/watch?v=EuLvZTjIONE

I have solved
I just had to log in with admin and leave blank as password then I changed my password and name