Red-eye error when taking pictures is quite common when taking photos in low light conditions using a flash. At this time, the pupils' pupils are reflected with the light of the flash causing the red eye.
So Fotor would be the ideal choice for you. This tool is completely free, supporting brightness adjustment, contrast, white balance and color saturation of the image.
You are not proficient in Photoshop but are you in need of some photo editing before sharing to your friends and loved ones?