TEXT* willkommen
{
...
strings = 5; // 5 differenet string pointes
string = willkommen, dies_ist, ein, text,string1;
}

...

my_text.string[3] = new_string;

STRING** tst;
tst = malloc(sizeof(STRING*),number of elements);
for(int i=0;i<number of elements;i++)
tst[i]=str_create("#number of characters");

//now you can access the string array like this:

str_cpy(tst[0],"hallo");