To get returned values you simply have to:
lineup,linemid,linedown,up,dn,mid,mab,mbb=CALL CamTDI //or x1,x2,x3,x4,x5,x6,x7,x8=CALL CamTDI or ignored,ignored,x3,x4,x5,x6,x7,ignored=CALL CamTDI (choose the values of interest for you)
If, instead, you want to change the values passed on to the indicator, then you have not to declare them inside the indicator as static variables, but declare them from within ProBuilder clicking on the upper left spanner and then iserting the names of the variables in the desidered order (comment them out in the code), then call it with either constants or variables:
lineup,linemid,linedown,up,dn,mid,mab,mbb=CALL CamTDI(13,34,2,7)
// or
v1=13
ve=34
v3=2
v4=7
lineup,linemid,linedown,up,dn,mid,mab,mbb=CALL CamTDI(v1,v2,v3,v4)
documentation will be of further help, as Vonasi suggested.