[QUESTION] How to swap external to internal on GT-S7562? - Android Q&A, Help & Troubleshooting

Hi guys, I have got Galaxy S Duos (GT-S7562). I rooted it. Then, i downloaded Link2SD but it didn't work. After that i tried use external 2 internal app.But my phone hasn't got free space. Then i downloaded root explorer,opened vold.fstab. It is here. What should i do?
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[
## Vold 2.0 Generic fstab
## - San Mehat ([email protected])
##
#######################
## Regular device mount
##
## Format: dev_mount <label> <mount_point> <part> <sysfs_path1...>
## label - Label for the volume
## mount_point - Where the volume will be mounted
## part - Partition # (1 based), or 'auto' for first usable partition.
## <sysfs_path> - List of sysfs paths to source devices
######################
#storage_struct = series, "/mnt/sdcard/extStorages"
#storage_struct = parallel
{
supported_exfat = yes
}
dev_mount sdcard /mnt/extSdCard auto /devices/platform/msm_sdcc.1/mmc_host/mmc1
#usb host device
{
media_type = usb
supported_exfat = yes
}
dev_mount sda /mnt/UsbDriveA auto /devices/platform/msm_hsusb_host/usb
#usb host device
{
media_type = usb
supported_exfat = yes
}
dev_mount sdb /mnt/UsbDriveB auto /devices/platform/msm_hsusb_host/usb
#usb host device
{
media_type = usb
supported_exfat = yes
}
dev_mount sdc /mnt/UsbDriveC auto /devices/platform/msm_hsusb_host/usb
#usb host device
{
media_type = usb
supported_exfat = yes
}
dev_mount sdd /mnt/UsbDriveD auto /devices/platform/msm_hsusb_host/usb
#usb host device
{
media_type = usb
supported_exfat = yes
}
dev_mount sde /mnt/UsbDriveE auto /devices/platform/msm_hsusb_host/usb
#usb host device
{
media_type = usb
supported_exfat = yes
}
dev_mount sdf /mnt/UsbDriveF auto /devices/platform/msm_hsusb_host/usb
#EOF
And if i change this can i download apps to SDCard?