I have just started using Foxsat HDR and so far I am very pleased with it.
Ideally you do need twin LNB but to get you started you can use your existing single LNB for watching one channel whilst recording another or recording two channels simultaneously with the following restriction.
If the channel you are watching is polarized horizontally then you can only watch horizontally polarized channels.
Don,t panic!!
Although you can't see which polarization you are using, if you try to select a vertical channel, a bar sign shows at the top of the screen. The EPG also highlights (Bold text) the useable channels.
To achieve the above; plug single LNB into "Lnb1" in and use a short jump cable to connect "Lnb1 out" to "Lnb2 in"
If you select the non freesat menu structure, you can then use the card slot to view encrypted channels on whatever sat you are receiving with the exception of Sky.
Hope this helps