how to add sign in pdf

1:41

9:35

7:50

5:46

7:53

6:34

9:55

9:27

13:29

5:00

7:13

5:32

3:16

11:16

30:01

16:36

7:40

3:05

2:54

4:49

2:17

2:03

1:50

17:59

1:53

15:25

4:57

4:00

10:01

4:22

کوتاه

2:54

1:11

1:51

5:28

2:54

5:09

1:36

1:47

9:17