Hello,
I have 1 TB drive, I used to have Windows, it has 2 partitions, first had Windows that I now have deleted and installed Fedora.
Second partition is read only.
I did some googling, but couldn’t figure out much.
Even if I write admin:// before /mnt as shown in screenshot I still couldn’t delete anything. Tho if I go to properties from file manager it says “create and delete files” but I couldn’t do that neither from file manager or from other apps.
Here’s some screenshots that may provide useful info.
The usually fix is to boot back into windows and turn off Windows fast boot.
That will unmount the NTFS partition fully and allow Fedotra to mount it read-write.
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Disabling Fast Startup after having Windows removed could be tricky. There is a tool called ntfsfix (from the ntfs-3g package) that might be able to mark the partition as clean, though I have never used it.
If you intent to keep using that partition, it would be better to backup important data, then format the partition with a native linux file system (ext4, btrfs, xfs, …)
I don’t have windows
There is a fairly detailed description of the issue at Linux Uprising.
I would make a copy of the partition on another drive before trying ntfsfix (more out of interest to see what happens), but then follow the suggestion to switch to a native linux filesytem.
This is what happened and nothing is changed. I don’t have another drive to copy data to and my internet is too slow, cloud backup would take days 
So I’m stuck with this for now I guess.
Use ntfsfix with sudo
I know you did try to access the mounted folder with admin:/// prefix, but I wonder if it changes anything if you mount the NTFS drive under a mount point with r+w acess rights, e.g. under your home folder.
One other idea is that instead of mounting the drive as auto, force it to use specifically one of the available NTFS drivers:
mount -t ntfs3 /your/device /your/mountpoint
or, if the above still doesn’t work:
mount -t ntfs-3g /your/device /your/mountpoint