You can add a security question to your account from your Security Settings page:
1	You	you	PRON	PE	Person=2|PronType=Prs	3	nsubj	_	_
2	can	can	AUX	VM	Mood=Ind|Person=3|Tense=Pres|VerbForm=Fin	3	aux	_	_
3	add	add	VERB	V	VerbForm=Inf	0	root	_	_
4	a	a	DET	RI	Definite=Ind|Number=Sing|PronType=Art	6	det	_	_
5	security	security	NOUN	S	Number=Sing	6	nmod	_	_
6	question	question	NOUN	S	Number=Sing	3	obj	_	_
7	to	to	ADP	E	_	9	case	_	_
8	your	you	DET	AP	Poss=Yes|PronType=Prs	9	nmod:poss	_	_
9	account	account	NOUN	S	Number=Sing	3	obl	_	_
10	from	from	ADP	E	_	14	case	_	_
11	your	you	DET	AP	Poss=Yes|PronType=Prs	14	nmod:poss	_	_
12	Security	Security	PROPN	SP	_	13	nmod	_	_
13	Settings	Settings	PROPN	SP	_	14	nmod	_	_
14	page	page	NOUN	S	Number=Sing	3	obl	_	SpaceAfter=No
15	:	:	PUNCT	FC	_	3	punct	_	_
