MacBook Pro (8GB) Need more storage, help.

That 8GBs is not storage. It is your RAM memory. Storage is the space on the SSD. If you need more disk storage, then you will have to use an external drive or take the computer to your local Apple Store/retailer and see about replacing the SSD with one of a larger capacity. Depending upon which exact model you have you may be able to do this yourself by looking for such options from OWC.

How to Free Up Space on The Hard Drive

1. You can remove data from your Home folder except for the /Home/Library/ folder.
2. Visit The XLab FAQs and read the FAQ on freeing up space on your hard drive.
3. Also, see Freeing space on your Mac OS X startup disk.
4. Free up storage space on your Mac.
5. See Where did my Disk Space go?.
6. Be sure to Empty the Trash to recover the space.
7. Replace the drive with a larger one. Check out OWC for drives, tutorials, and toolkits.
8. Use OmniDiskSweeper or GrandPerspective to search your drive for large files and where they are located.

Are asking about RAM or hard drive storage space? If you are asking about RAM you can not upgrade it. If you are asking about hard drive storage space then try the OWC site to see what is available for your model/year computer.