Math Help - plotting parametric graph

hi, i m a newbie in desmos graphing software, and i m wondering how to do parametric graphing there.
for your convenience here's my equations

p=p(t)=k(sinh (t)-t)

r=r(t)=1/3*k(sinh(t)-8sinh(0.5t)+3t)

now how can i plot
p=p(r) and

r=r(p)
? anyone plz help me

You can read the user guide (PDF) by clicking on the question mark in the top-right corner and selecting Desmos User Guide.

Just enter the following:

((1/3)*k(\sinh (t)-8\sinh (0.5t)+3t),k(\sinh (t)-t))

Below the equation a message appears offering to add a slider for $k$ (since it's a free variable). After clicking $k$, another message appears below the equation saying "domain: $0\le t\le 1$". Clicking it allows selecting the interval where $t$ ranges.

thanks a lot..that helps