How can I edit the community wiki?

I've found an error in the wiki, specifically in TFTP (remote/network kernel) using U-Boot. I joined the community, thinking I could fix the problem, but still can't find any info on how to edit a specific page. Do I have to wait a certain amount of time, or is there some other hurdle I must jump?

BTW, the error is about halfway down the page:

VExpress64# set origbootcmd "$bootcmd"
VExpress64# set bootcmd "dhcp: tftp ${kernel_addr} ${serverip}:Image; tftp ${fdt_addr} ${serverip}:juno/juno.dtb; booti ${kernel_addr} - ${fdt_addr}"
VExpress64# saveenv

At the least that ":" after "dhcp" should be a semicolon, but also the dhcp command will by default try to boot from the network. Fixed version:

VExpress64# set origbootcmd "$bootcmd"
VExpress64# set autoload no
VExpress64# set bootcmd "dhcp; tftp ${kernel_addr} ${serverip}:Image; tftp ${fdt_addr} ${serverip}:juno/juno.dtb; booti ${kernel_addr} - ${fdt_addr}"
VExpress64# saveenv