what do you mean you are stuck? can you explain what you did?
here is partitioning in a nutshell:
1. harddrive is space that you can use but before you can use it you have to partition it and each partition has to be formated before it can be used.
in simplest case you just make one partition that occupies entire drive. or you can split it into multiple partitions if you like.
2. there are different types of partitions: primary and extended. in total you can have up to 4 per drive (all 4 can be primary or 3x primary and one extended).
partition that is marked as active is one used to boot. in your case that is first partition which is known as C: drive.
extended partition is sort of virtual drive, it can be further divided into logical partitions (which act in many ways like regular partitions but normally are not bootable). if you are new to this, just stick to primary partitions.
3. partitions also have type depending on file system that will be used. choose type that matches your needs. if you are installing Linux, you will want one of EXT types etc.
4. once the partition is created (using any kind of partitioning software like gparted, fdisk or whatever), it still need to be formated before it can be used.
note: if you are using Windows to format the partitions, you may have to reboot so windows recognizes that there was change in partitions. Windows supports several file systems, FAT16 is not suitable as it only works for smaller partition size. FAT32 may be not suitable either if you expect files larger than 4Gb (some file types that commonly get large are .ISO .MKV etc.) so safest bet is to use NTFS. once the drive is formatted, windows still needs handle to access it (drive letter). you can assign drive letter from Control Panel, Administrative Tools, Drive Manager. if the partition is formatted by Windows and not some 3rd party tool, letter is assigned automatically.
there is more to it but i am tired of typing so this is it for basics.
back to your issue:
normally partitions cannot be created in the middle of the drive - some partitioning tools create partitions one after another. but once this is done, previous partition can be removed and the second one will remain in place. but your program is more flexible and supports moving partitions:
https://www.partition-tool.com/easeus-partition-manager/help/moving-parition.htm
if there is an error or something,post it. chances are that some files on that partition are used. if you installed your partitioning software on that partition, you will not be able to move that partition. this is why best way to partition is to boot from CD or USB and not use anything from hard drive until job is done.