Repeat Metal Hotspot with captive portal

Hi everyone, (excse my poor english)
so with the help of a friend, i have set a hotspot with captive portal.
Erthing is ok except that some clients can’t connect to the Hotspot from their home. So i planned on using a repeater/range extender at their place.
PROBLEM: ain’t gettin no captive portal where to enter the voucher-codes.

using TL-WR841N to repeat signal from a Metal SHP2n

Would be nice if anyone could help out

Thanks