O2 mobile wifi - how do I get to port forwarding settings on a Huawei wifi router

[jg]

I wish to set up my Haewei 4g to wifi router port forwarding. I can get into the router but can not see how to do this . There are help instructions to do this in Security but can not get to the ADD button they describe. Thanks.

[MI5]

@jg 

Is this any help https://portforward.com/huawei/e355/

[jg]

Thanks for that but when I log into the router this is all I see. 

[jg]

The router is a - Huawei Model: HB434666RBC bought from O2.

[MI5]

I'd suggest a call to Huawei https://consumer.huawei.com/uk/contact-us/

[jg]

O2 technical phoned me back yesterday, Said they do not know why this is. Asked me to take the router to an O2 shop. I did this to be told 'we can not help' . I phoned Huawei who were very helpful but again could not help - they thought O2 were blocking the settings. Phoned o2 technical today just to ask if they would allow a 3rd party mobile router but the guy put the phone down on me. Phoned o2 customer services to again be told we can not help. So I have bought a router from O2 I am paying each month for network but they will not help. Does anyone know if I buy another mobile 4g to wifi router that can allow port forwarding changes will O2 allow it to wotk on their network?