Help Adding An Incrementing number to an entry

[Elsys]

I use this program to autorespond on messageboards when im away I would like to add a number to the end of the input that goes up by one each time it autoposts.

For instance

Im Away 1

next post

Im Away 2

next post

Im Away 3

and so on...

I can get it to display the numbers yet I cannot get it to increment them properly