border boundary

as said in the tutorials: border is a mouse-controlled input of boundary conditions along the boundaries of the model. A constant value can be set, or, by setting a start and an end value, a linear interpolation along the boundary is performed.
i would like to ask a help for the realization of this step, how to set the start and end value?
thanks

set the start value in the same way as for a constant bc, then move the mouse. somewhere in between the starting and the final point, hit the tab key, change the value in the keyboard request box, hit enter and go on until the last point.

thank you very much

Hallo everybody!
How can I apply the same boundary condition in the standard version (6.0)? I know how to do it in the classical version: I would like to improve myself using the last Feflow version.
Thanks