Issue to add external SSD storage

Hi, how I can mount external 4TB SSD drive to home assistent? my SSD drive have exFAT I see on internet that they just plug in Raspberry pi 4 B and it show up? but I cant find it in folders?

I also try to create new mount point “mkdir /mnt/ssd” and after that “mount -t exfat /dev/sda1 /mnt/ssd” and I get error permissions denied?

I try sudo, command dont found