point 1 you lost me i am not sure what you trying to do.
point 2 the little antenna symbol is a warning and lets you know that this is a short circuit between the 2 nets.
you can verify the connection when you generate gerbers.
do you want the track to pick up the net "gnd" ?
to do that:
1. use the edit > select > connected copper menu
2. click on the track
3. go to pcb inspector panel, and selct net conenction from drop down menu: "gnd", press enter
4. stretch or route the track onto the pad
do you know ahat panels are in altium PCB editor? PCB-panel, PCB Instector -panel, Messages -panel...
these "panels" are the stuff with info and buttons on them on the left or right of your screen. One of them is called "PCB Inspector" panel.
Basic Altium user knowledge.
If this one is not visible, then you have to turn it on at the lower right corner with a button [PCB], it opens a list and click PCB inspector.