How can i control my upload speed in my router?

i have 10mb download speed and nearly 500kb upload speed, when my siblings use the wifi and like sending pics or uploading stuff or they’re devices are syncing it fills the whole speed of the upload and causes so much lag for me when i play online, i tried looking on my routers settings d-link 2750u by the way, it doesn’t have options to control the traffic bandwidth, so i’m out of solutions here i need help!