How can I do load balance

Hi all
Can I do this in mikrotik please
I have this solution
Input:

Isp 1 ip address 192.168.45.1 this ip router 1 link speed 5M download upload 512
Isp 2 ip address 192.168.99.1 this ip router 2 link speed 5M download upload 512

I have mikrotik os install on intel 845 I have 4 network card

Network number 1 work as link 1 isp 1 ip 192.168.45.1 from router 1
Network number 2 work as link 2 isp 1 ip 192.168.99.1 from router 2

------------
Network card number 3 work as hotspot ip address 10.10.10.1\24
Network card number 4 work as pppoe ip address 10.90.90.1\24

How can I do load balance in isp 1 and isp 2

Doesn't he/she speak Portuguese?
he/she was complicated for community!

hugs

sory for english but i dont know protuguese and i dont fine fourm like this forum
if u want to reply u can speak portuguese i well translet it in google lang
thank you