Your system was (and apparently still is) a single, small partition. The root file system, "/", cannot be resized while the system is running.
It is possible to resize it, but I do not believe you have the technical and language skill to accomplish it.
You are much better off re-installing the OS.
General steps to resize your root :
1. Boot the ramdisk kernel, enter the shell.
2. Temporarily mount the root partition
3. Copy growfs to the ramdisk partition
4. Unmount the root partition
5. Resize the MBR partition as required.
<This may require other OSes be moved>
6. Run disklabel, resize the "a" partition as required
<This may require moving your swap partition, if you have one>
7. Run growfs
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