how to change DHCP IP reservation settings on router CODA-5519?

recently it was possible to login to 192.168.1.1 with admin : admin credentials and there was full set of settings of this router.
but this time I can not login in this way. it is possible to login only via https://aminhanet.nos.pt/ and this web interface has no options to configure DHCP settings, except disabling DHCP at all.
 

UPD: admin : password works

Hi,

How can you access the router  with user/pass? I only have aminhanet.

With a pc with ethernet cable you type 192.168.1.1 in the browser

Vai para a página com o estado do equipamento. 

CHITA-Hub5

Hello @jrm and @Mariia Zakharova,

Thank you for reaching out to us. 

The router’s management is made through nosnet.pt or the NOS NET app.

Thank you