help with ssd

dont know if this the correct forum but here goes
I have installed Libreelec on an NUC on a 512mb partition the other partition is formatted EXT4 and is totally blank ( i did this with gparted),
my problem is how do i access this second partition both from within libreelec and also from my windows 10 laptop.

second question is i am unable to access a source to add repos in libreelec it says couldnt retrive directory information this could be due to network not being connected.. this happens with all remote sources i try to add.
i am using the latest libreelec Jarvis on a nuc 5cpyh
sorry if this has already been answered but i have googled the problem with no success
thanks in advance